VeriFone MX800 series Programmer's Manual page 107

If in Feature C mode and VISA is not enabled:
Prototype
struct vficomErrCounts *result = ecrStatus(int*buf);
Copy current status information to caller's 4-byte buffer.
The number of bytes pending in the input buffer.
1st
The number of free bytes available in the output buffer.
2nd
Current signal information for port:
3rd
(all bits for corresponding signals are set if hardware supports
signal for that port and the signal is detected to be asserted.
Otherwise bit is not set.)
0x80
0x40
0x20
0x10
0x08
0x04
0x02
0x01
set if DTR detected
set if RTS detected
set if CTS detected
set if Ring Indicator is present
set if Carrier Detect (CD) present
set if DSR detected
Reserved
Reserved
X
M
D
EVICE
800 S P G
ERIES ROGRAMMERS
D
RIVERS
ecrStatus
107
UIDE